350 Hemi, High Output Cummins - READ ONLY

28 messages, Last post on Jul 11, 2003 at 6:50 AM

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What is this discussion about? Dodge Ram Pickup 2500, Dodge Ram Pickup 3500, Fuel System, Engine, Diesel, Fuel Efficiency (MPG), Truck

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#4 of 28 5.7 hemi by hersbird May 21, 2002 (7:42 pm)
I've read at www.allpar.com that the 5.7 hemi's manufacturing costs are lower then the OHC 4.7's! I bet they still charge more for it! I would kill to see this motor in the current style Dakota. Now that they cancelled the redesign (of the Dakota) I think it's a possibility, but not likely. Man I'd trade my 2000 R/T in on a 2004 or 2005 5.7 Dakota in a minute, especially if they finish that Mercedes designed 5-speed for it (the nv-3500 can't take the torque output of the current 360 let alone the 5.7, and the Rams nv-4500 won't fit the Dakota without a redesign.) Otherwise they are supposed to beef up the 45rfe to handle the 5.7 but judging from problems with it on the 99 Grand Cherokees when first introduced, I wouldn't want to be a test pilot. That new Intrepid police package is supposed to be pretty awesome. They only will sell it to law inforcement, it's like a heavy duty, poor man's 300M. The new cummings will be the top class of pickup diesels (heck, the current Cummings still is, and they have redesigned it!). It is supposed to have a bunch more power and yet be as quite as a gas motor. I think Dodge will be picking up some market share in the 2500, and 3500 series trucks in 2003 with these two new motors and the new style.
#5 of 28 hersbird by catam May 21, 2002 (8:26 pm)
Don't believe everything you read/hear. GM tried to promote the Duramax diesel as being as quiet as a gasser, and no diesel smell. While it is clearly the most quiet of the big diesels, it is also not anywhere near a gasser. I am sure the new Cummins will likely provide many improvements over the current model, but will it be as quiet as a gasser, I'll believe it when I hear it. Also, I know there has been discussion about the auto trannies, but the last I read anything official, D/C still is going to detune the new Cummins when it is mated to an Auto tranny. This is going to hurt their sales as the vast majority of HD trucks sold are sold with auto trannies. Both Ford and GM put full power in place with the auto units, which will leave the Cummins still in 3rd place in the power war. I agree the new Cummins will likely be the best available diesel with a manual tranny. But I would definitely wait 2 years or so to allow them to work the bugs out. That seems to be the trend based on Ford and GM redesigns.
#6 of 28 Allison and GM by jaijay May 22, 2002 (2:19 am)
I believe Allison Transmission is a subdivision of GM and has been in the GM family since 1929.
#7 of 28 So,... by markbuck May 22, 2002 (8:22 am)
Will Dodge make a 'real' crewcab in their new lineup? I like the Cummins best in diesels, but my buddies have had all kinda problems on older dodge trucks with their auto trannys and poor brake designs. I bought a 2500hd CC last year, with the 6.0L and a 5 speed manual. If I coulda got a cummins in that 2500HD I woulda bought it! Noway do I want one of those Isuzu Duramax things.... The new Ford 600 diesel looks good too. But I agree, we'll have to look at them a coupla years out.
#8 of 28 Markbuck by kg11 May 22, 2002 (4:38 pm)
What's wrong with Isuzus Duramax? Our '98 Isuzu NPR has almost 300k with no engine or trans (Allison) problems. kip
#9 of 28 Isuzu Turbo DieselTrooper - 1986 by markbuck May 23, 2002 (8:16 am)
Broken Rod, Damaged Crank at 40k miles. I did all the oil changes, vehicle towed a three rail motorcycle trailer, but other than that, no harsh use. Catastrophic engine failure. Isuzu finally offered parts only, after dealing with their zone rep. I won't ever buy another Isuzu or Isuzu derived product..... BTW, had a blown head gasket on the previous vehicle, a Mazda PU at 40k miles, Mazda picked the whole thing up. Both companies later had recalls for those problems, when I contacted Isuzu, they refused to compensate me for the $1500 labor bill, as I had sold the vehicle. My Ford 7.3L diesel went 185,000 with nary a problem....... Now my 6.0L GMC has light (annoying) piston slap in the 30s to 2 minute period post start.....
#10 of 28 Allison and GM............ by dustyk May 23, 2002 (5:38 pm)
I stand corrected. And I knew that, too since I was a GM employee. I was thinking of New Process Gear, which was at one time wholly owned by Chrysler, and is now (I think) a joint venture between Chrysler & GM. Dusty
#11 of 28 Early 45RFE failures............... by dustyk May 23, 2002 (5:40 pm)
............were 1999 Grand Cherokees and the result of the wrong lubricant being installed at the factory. If I recall correctly, this affected approximately 18,000 units. Dusty
#12 of 28 Transmissions by hersbird May 23, 2002 (8:01 pm)
Some people who saw the street testing of the new cummings said they were as quite as a gas, not a factory claim. Here is a link to the Buzz: http://www.car-truck.com/chryed/buzz/b042302.htm Even the standard cummings for 2003 will be 250 HP 2900 RPM and 460 ft-lbs 1700 rpm with the automatic, and it too gets the new high pressure common rail injection. Ford's manual transmission diesels do have more HP then the autos, but the Chevy with the Allison is the same. It is yet to be seen if the new HO cummings will not be available with the automatic because there are some possibilities of using a mercedes truck automatic (possibly the reason they didn't go with the Allision.) Dusty was right, even if Chrysler never owned any part of Allison, they did turn down the opportunity to use the Allison in the new ram. The contract to do it was signed by both parties but something went sour. Allison had even boosted production capasity and has since released a memo on their commitment to service other OEM then GM. The Allison is supposed to still show up in the Chassis Cab 3500, 4500, and 5500 series trucks though.
#13 of 28 More on the new Chrysler Hemi.......... by dustyk May 30, 2002 (7:56 pm)
Some information given to me by a good friend of mine regarding some pre-release specifications from Chrysler on the new 5.7L hemi motor: -It will be 345 CID, not 353 as mentioned in various magazines. Horsepower will be 345. -A 6.1L version will be introduced at a later date. -The block will be made of high nickel content cast grey iron and incorporate a new process which will increase torsional rigidity by 28%. This helps reduce noise by -6dB. Cylinders will be deep skirt. -The nodular sand cast crankshaft will be crossbolted with M12 caps and M8 crossbolts, internally counterbalanced and fully counterweighted, incorporate a new method of microfinishing that is better than the current Nissan motors, reducing bearing friction by 44% over the previous 360 CID. -The new 345 will be 100 lbs. lighter than the 360 CID it will replace and dimensionally smaller. -Bore will be 3.92. Stroke is 3.58. -Pistons will be cast aluminum made by Mahle Castings. They will have a low friction skirt coating and will weight 412.000 grams. -Deck height will be 9.25 inches. The cam tunnel will be 7.44 inches from the crankshaft centerline resulting in greatly shortened pushrods. This translates to less valvetrain mass, flex, and greater RPM capability. -A seven quart oil pan will be used for truck applications. -Oil pressure range will be 40 lbs minimum (idle) and 90 lbs. max at 3100 rpm. -There will be two plugs per cylinder, but only eight plug wires. -Valves will be 2.00 inches intake (18 degree seats) and 1.55 exhaust (15.5 degree seats). The heads will allow a maximum of 2.125 intake and 1.90 exhaust. -Heads will be cast aluminum and the ports will be directly on the chamber centerline. Chambers will be 85cc and utilize a slightly flat roof at the chamber apex. Ten bolts per head. The head gasket is multi-layered and use "torque-to-yield fasteners. - Compression ratio will be 10.5 on pump gas. -Valve springs will be low-mass, low pressure "beehive" single spring units and rated at 94 lbs seat pressure. -Camshaft will be roller type and incorporate low-inertia, investment cast rockers. Rocker ratio is 1.65:1. _The induction system will use a 80mm sidedraft throttle body, tuned-runner nylon plastic manifold. Runners are just over 14 inches long. Dusty